Tube drill



Oct 1929. A. R. KRAUSE ET AL 1,731,010

TUBE DRILL Filed July 5, 1927 2 Sheets-Sheet l 4 firm,

:75 l Nil :75 a ,1 /9 54 $22 25 528 Q0 Q2 5 19 /Q 1 Q9/ I l VE III-H5Hr'noldR.A r'au.se,

H0 warn 0. Hit/c6075 by WW5;

Oct. 8, 1929. A. R. KRAUSE ET AL TUBE DRILL Filed July 5, 1927 2Sheets-Sheet 2 1\ i I! 5, I? 27.

VE DRE Brno/01R. Krause,

Howard 0. huf'ch ems.

Patented Oct. 8, 1929 UNITED STATES PATENT OFFICE ARNOLD R. KRAUSE ANDHOWARD O. HUTCHENS, OF EAU CLAIRE, WISCONSIN,

ASSIg-NORS TO GILLETTE RUBBER COMPANY, OF EAU CLAIRE, WISCONSIN, A COR-PORATION OF WISCONSIN TUBE DRILL Application filed July 5, 1927.

This invention relates to'a tube drill or rotary punch for perforatingthe valve stem hole in automobile inner tubes.

It is an object of this invention to provide an improved machine of theclass described wherein positive means are provided for ejecting the cutout rubber discs from the in terior of the punch. In leather and paperpunches, the discs are allowed to accumulate in the hollow joint of thepunch until a sufficient number are present to force the uppermost discsout through a side opening in the punch. lVith rubber punches, however,the side outlet in a rotary punch is undesirable as well as causingtrouble due to the sticky and elastic character of the discs which arecompressed at each stroke of the punch, and are as apt to stick in thepunch and expand downwardly upon the return stroke as they are to moveupwardly and out through the side outlet. In practice, the use of such apunch requires frequent stoppages to clear the punch and it isaccordingly an object of this invention to provide a mechanical ejectorfor the cut discs which operates on the return stroke of the punch.

It is also an object of this invention to provide means for feeding acutting or lubricating liquid to the point of the punch to assist in thecutting operation and prevent sticking of the tacky cut surfaces.

Other and further important objects of this invention will be apparentfrom the disclosures in the specification and the accompanying drawings.

This invention (in a preferred form) is illustrated in the drawings andhereinafter more fully described.

011 the drawings:

Figure 1 is a side elevation of a machine embodying the features of thisinvention.

Figure 2 is a front elevation thereof.

Figure 3 is a top plan view of the machine.

Figure 4 is an enlarged section on the line IV-IV of Figure 3.

Figure 5 is a fragmentary detail section of the lubricant feeding meansfor the punch.

As shown on the drawings:

The apparatus comprises a pedestal 1O supporting a column 11 near thetop of which Serial No. 203,315.

are secured collars 12 and 13, collar 12 Sup porting an outstanding arm14, the outer end of which carries an inserted crowned head plug 15,preferably hardened, which serves as an anvil for the punch or drill tobe described hereinafter.

The collar 13 forms part of a double armed bracket, the rear arm 16 ofwhich forms a shelf for a motor 17 which drives the rotary cutter pulley18 by means of a round belt 19. The drive is shown as a right angledrive in order to provide for belt alignment during the verticalmovement of the cutter pulley 18.

The front arm 20 extends above and parallel to the anvil arm 14 and isforked at 21 on the outer end in alignment with the anvil plug toreceive a reciprocable sleeve 22 carrying a hollow punch spindle 23journalled therein in ball bearings 24. The sleeve 22 is reciprocated bymeans of a fork ended lever 25, the forks 26 of which engage pins 27carried by the sleeve. This lever 25 is pivoted at 28 to' the arm 20 andthe other end is engaged by a link 29 connected to a foot lever 30, aspring 31 acting to pull the link downwardly to normally hold the sleeve22 in its upper position.

The punch proper is indicated at 32 in F igure l, and is screwed intothe end of the punch spindle in order that it may be replaced orsharpened readily by removal from the spindle, wrench flats beingprovided on both the punch and the spindle. Stripping fingers are shownin the figures to prevent the punched tube from moving up on the shankof the punch.

A belt guard 34 is mounted on the arm 20 to cover the pulley 18, themounting for this guard also securing a bracket 35 in place above thehollow punch spindle. A rod 36 is secured in this bracket and extendsdown through the spindle 22 and punch 32, the lower end of the rodterminating just within the edge of the punch so that on the returnstroke of the punch, the cut plug carried therein is ejected by thestationary rod 36. An inclined funnel 37 is mounted in the bracket 35with the tip 38 of the funnel closely ad acent the rod 36 to deliverfluid thereto. A container 38 for cutting. and lubricating liquid issupported by the column 11 and feeds into the funnel 37 through a valve39.

The oneration of the machine will be easily understood from theforegoing. The operator slips one end of an unspliced tube over theanvil arm 14 and depresses the foot lever, forcing the rotating punchinto the tube. On

the return stroke of the punch the rod 36 pushes the cut plug out of thepunch.

1 We are aware that many changes may be 0 made, and numerous details ofconstruction may be varied through a wide range without departing fromthe principles of this invention, and We therefore do not purposelimiting the patent granted hereon, otherwise than necessitated by theprior art.

WVe claim as our invention:

1. In combination, i-n-a device for forming valve stem holes in innertubes, a support injcluding an elongated arm arranged to re- \ceive aninner tube thcreover, a crowned element connected to an end of said armformed to serve as an anvil, a rotary cutting tool above the anvil, andmeans for depressing the tool so as to bring it. into contact With theportion of the tube disposed on said anvil to cut a valve stem hole insaid portion.

2. In combination, in a device for forming valve stem holes in innertubes, a support including an elongated arm arranged to receive an innertube thereover, a crowned ele ment connected to an end of said armformed to serve as an anvil, a rotary cutting tool above the anvil,means for depressing the tool so as to bring it into contact with theportion of the tube disposed on said anvil, and an independent rodextending into said tool and arranged to force and remove rubber blanksfrom the tool on the return movement of the tool.

In testimony whereof, we have hereunto subscribed our names.

ARNOLD R. KRAUSE. HOIVARD O. I-IUTCHENS.

